Home / 21,120.54-29,138.04-13,565.82

Finding the Fourth Proportional to 21,120.54, 29,138.04 and 13,565.82

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Solution

The fourth proportional to 21,120.54, 29,138.04 and 13,565.82 is: 18,715.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.54 : 29,138.04 = 13,565.82 : x
  2. Step 2: Convert to fraction form
    21,120.54/29,138.04 = 13,565.82/x
  3. Step 3: Cross multiply
    21,120.54x = 29,138.04 × 13,565.82
  4. Step 4: Simplify right side
    21,120.54x = 395,281,405.79
  5. Step 5: Solve for x
    x = 395,281,405.79/21,120.54
  6. Step 6: Final answer
    x = 18,715.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.